GRAIN-ORIENTED ELECTRICAL STEEL SHEET, AND MANUFACTURING METHOD THEREFOR

• Main Authors: KO, Kyungjun, LEE, Sangwoo
• Format: Patent
• Language: English; French; Korean
• Published: 29.06.2023
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

A method for manufacturing a grain-oriented electrical steel sheet, according to one embodiment of the present invention, comprises the steps of: hot rolling a slab so as to manufacture a hot rolled sheet, the slab comprising, by wt%, 2.5-4.0% of Si, 0.03-0.09% of C, 0.015-0.040% of Al, 0.04-0.15% of Mn, 0.01% or less of S (excluding 0%), 0.002-0.012% of N, 0.01-0.05% of Sb, 0.03-0.1% of Sn, 0.05-0.2% of Cr and the balance of Fe and inevitable impurities; cold rolling the hot rolled sheet so as to manufacture a cold rolled sheet; performing primary recrystallization annealing on the cold rolled sheet; and performing secondary recrystallization annealing on the steel sheet having undergone primary recrystallization annealing. Un procédé de fabrication d'une tôle d'acier électrique à grains orientés, selon un mode de réalisation de la présente invention, comprend les étapes consistant à : laminer à chaud une brame de façon à fabriquer une tôle laminée à chaud, la brame comprenant, en % en poids, 2,5 à 4,0 % de Si, 0,03 à 0,09 % de C, 0,015 à 0,040 % d'Al, 0,04 à 0,15 % de Mn, 0,01 % ou moins de S (à l'exclusion de 0 %), 0,002 à 0,012 % de N, 0,01 à 0,05 % de Sb, 0,03 à 0,1 % de Sn, 0,05 à 0,2 % de Cr, et le reste étant du Fe et des impuretés inévitables ; laminer à froid la tôle laminée à chaud de façon à fabriquer une tôle laminée à froid ; effectuer un recuit de recristallisation primaire sur la tôle laminée à froid ; et effectuer un recuit de recristallisation secondaire sur la tôle d'acier ayant subi un recuit de recristallisation primaire. 본 발명의 일 실시예에 의한 방향성 전기강판의 제조 방법은 중량%로, Si: 2.5 내지 4.0%, C: 0.03 내지 0.09%, Al: 0.015 내지 0.040%, Mn: 0.04 내지 0.15%, S : 0.01% 이하(0%를 제외함), N: 0.002 내지 0.012%, Sb: 0.01 내지 0.05%, Sn: 0.03 내지 0.1% 및 Cr: 0.05 내지 0.2% 포함하고, 잔부 Fe 및 불가피한 불순물을 포함하는 슬라브를 열간압연하여 열연판을 제조하는 단계; 열연판을 냉간압연하여 냉연판을 제조하는 단계; 냉연판을 1차 재결정 소둔하는 단계; 및 1차 재결정 소둔이 완료된 강판을 2차 재결정 소둔하는 단계를 포함한다.